package com.ctrip.framework.apollo.biz.service;

import com.ctrip.framework.apollo.biz.config.BizConfig;
import com.ctrip.framework.apollo.biz.entity.Audit;
import com.ctrip.framework.apollo.biz.entity.Item;
import com.ctrip.framework.apollo.biz.entity.Namespace;
import com.ctrip.framework.apollo.biz.repository.ItemRepository;
import com.ctrip.framework.apollo.common.exception.BadRequestException;
import com.ctrip.framework.apollo.common.exception.NotFoundException;
import com.ctrip.framework.apollo.common.utils.BeanUtils;
import com.ctrip.framework.apollo.core.utils.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Map;

/**
 * Item Service
 */
@Service
public class ItemService {

    @Autowired
    private ItemRepository itemRepository;
    @Autowired
    private NamespaceService namespaceService;
    @Autowired
    private AuditService auditService;
    @Autowired
    private BizConfig bizConfig;

    @Transactional
    public Item delete(long id, String operator) {
        Item item = itemRepository.findOne(id);
        if (item == null) {
            throw new IllegalArgumentException("item not exist. ID:" + id);
        }

        item.setDeleted(true);
        item.setDataChangeLastModifiedBy(operator);
        Item deletedItem = itemRepository.save(item);

        auditService.audit(Item.class.getSimpleName(), id, Audit.OP.DELETE, operator);
        return deletedItem;
    }

    @Transactional
    public int batchDelete(long namespaceId, String operator) {
        return itemRepository.deleteByNamespaceId(namespaceId, operator);

    }

    public Item findOne(String appId, String clusterName, String namespaceName, String key) {
        Namespace namespace = namespaceService.findOne(appId, clusterName, namespaceName);
        if (namespace == null) {
            throw new NotFoundException(
                    String.format("namespace not found for %s %s %s", appId, clusterName, namespaceName));
        }
        Item item = itemRepository.findByNamespaceIdAndKey(namespace.getId(), key);
        return item;
    }

    public Item findLastOne(String appId, String clusterName, String namespaceName) {
        Namespace namespace = namespaceService.findOne(appId, clusterName, namespaceName);
        if (namespace == null) {
            throw new NotFoundException(String.format("namespace not found for %s %s %s", appId, clusterName, namespaceName));
        }
        return findLastOne(namespace.getId());
    }

    public Item findLastOne(long namespaceId) {
        return itemRepository.findFirst1ByNamespaceIdOrderByLineNumDesc(namespaceId);
    }

    public Item findOne(long itemId) {
        Item item = itemRepository.findOne(itemId);
        return item;
    }

    public List<Item> findItemsWithoutOrdered(Long namespaceId) {
        List<Item> items = itemRepository.findByNamespaceId(namespaceId);
        if (items == null) {
            return Collections.emptyList();
        }
        return items;
    }

    public List<Item> findItemsWithoutOrdered(String appId, String clusterName, String namespaceName) {
        Namespace namespace = namespaceService.findOne(appId, clusterName, namespaceName);
        if (namespace != null) {
            return findItemsWithoutOrdered(namespace.getId());
        } else {
            return Collections.emptyList();
        }
    }

    public List<Item> findItemsWithOrdered(Long namespaceId) {
        List<Item> items = itemRepository.findByNamespaceIdOrderByLineNumAsc(namespaceId);
        if (items == null) {
            return Collections.emptyList();
        }
        return items;
    }

    public List<Item> findItemsWithOrdered(String appId, String clusterName, String namespaceName) {
        Namespace namespace = namespaceService.findOne(appId, clusterName, namespaceName);
        if (namespace != null) {
            return findItemsWithOrdered(namespace.getId());
        } else {
            return Collections.emptyList();
        }
    }

    public List<Item> findItemsModifiedAfterDate(long namespaceId, Date date) {
        return itemRepository.findByNamespaceIdAndDataChangeLastModifiedTimeGreaterThan(namespaceId, date);
    }

    @Transactional
    public Item save(Item entity) {
        // 校验 Key 长度
        checkItemKeyLength(entity.getKey());
        // 校验 Value 长度
        checkItemValueLength(entity.getNamespaceId(), entity.getValue());
        // protection
        entity.setId(0);
        // 设置 Item 的行号，以 Namespace 下的 Item 最大行号 + 1 。
        if (entity.getLineNum() == 0) {
            Item lastItem = findLastOne(entity.getNamespaceId());
            int lineNum = lastItem == null ? 1 : lastItem.getLineNum() + 1;
            entity.setLineNum(lineNum);
        }
        // 保存 Item
        Item item = itemRepository.save(entity);
        // 记录 Audit 到数据库中
        auditService.audit(Item.class.getSimpleName(), item.getId(), Audit.OP.INSERT, item.getDataChangeCreatedBy());
        return item;
    }

    @Transactional
    public Item update(Item item) {
        checkItemValueLength(item.getNamespaceId(), item.getValue());
        Item managedItem = itemRepository.findOne(item.getId());
        BeanUtils.copyEntityProperties(item, managedItem);
        managedItem = itemRepository.save(managedItem);

        auditService.audit(Item.class.getSimpleName(), managedItem.getId(), Audit.OP.UPDATE,
                managedItem.getDataChangeLastModifiedBy());

        return managedItem;
    }

    private boolean checkItemValueLength(long namespaceId, String value) {
        int limit = getItemValueLengthLimit(namespaceId);
        if (!StringUtils.isEmpty(value) && value.length() > limit) {
            throw new BadRequestException("value too long. length limit:" + limit);
        }
        return true;
    }

    private boolean checkItemKeyLength(String key) {
        if (!StringUtils.isEmpty(key) && key.length() > bizConfig.itemKeyLengthLimit()) {
            throw new BadRequestException("key too long. length limit:" + bizConfig.itemKeyLengthLimit());
        }
        return true;
    }

    private int getItemValueLengthLimit(long namespaceId) {
        Map<Long, Integer> namespaceValueLengthOverride = bizConfig.namespaceValueLengthLimitOverride();
        if (namespaceValueLengthOverride != null && namespaceValueLengthOverride.containsKey(namespaceId)) {
            return namespaceValueLengthOverride.get(namespaceId);
        }
        return bizConfig.itemValueLengthLimit();
    }

}
